For hard rock, listen to "Kiwi", "Carolina", "Only Angel", and "Woman". "Sign of the Times" is more like David Bowie or Queen. "Sweet Creature" is folkier and at the beginning kind of sounds like Vance Joy's "Mess Is Mine". "From the Dining Table" is my personal favorite. It breaks my heart every time I listen to it. "Meet Me in the Hallway" is similar to FTDT. I would say "Ever Since New York" and "Two Ghosts" are the poppiest songs, but there's more to them than that. "Lights Up", Harry's newest single is more indie-poppy and it's a beauty. You should see the music video. And he's coming out with a whole new album on December 13th, so definitely check that out!